package readers

import (
	"StoreBackEnd/pkg/protocol"
	"StoreBackEnd/pkg/protocol/repository"
	"StoreBackEnd/pkg/protocol/rules/writers"
	"bufio"
	"fmt"
	"os"
)

// EraseFileRulePrefix Identifiant de cette règle
const EraseFileRulePrefix = "ERASEFILE"

// EraseFileRule Demande de suppression d'un fichier
type EraseFileRule struct {
	// Cmd Nom de la règle
	Cmd string
	// matcher Permet de vérifier le matching
	matcher *protocol.RegexMatcher
	// protocolRepo Instance de ProtocolRepository
	protocolRepo *repository.ProtocolRepository
	// storagePath Chemin de stockage du fichier
	storagePath string
}

// CreateEraseFileRule Création d'une instance de EraseFileRule
func CreateEraseFileRule(pattern string, protocolRepo *repository.ProtocolRepository, storagePath string) protocol.IProtocolReader {
	return &EraseFileRule{
		Cmd:          EraseFileRulePrefix,
		matcher:      protocol.CreateRegexMatcher(pattern),
		protocolRepo: protocolRepo,
		storagePath:  storagePath,
	}
}

func (rule EraseFileRule) GetCmd() string {
	return rule.Cmd
}

func (rule EraseFileRule) Execute(data string) (*protocol.ProtocolWriterResult, func(reader *bufio.Reader) *protocol.ProtocolWriterResult) {

	if rule.Match(data) {
		values := rule.matcher.Parse(data)

		errRemoveFile := os.Remove(fmt.Sprintf("%s/%s", rule.storagePath, values[1]))
		if errRemoveFile != nil {
			return rule.protocolRepo.ExecuteWriter(writers.EraseErrorRulePrefix), nil
		}

		return rule.protocolRepo.ExecuteWriter(writers.EraseOkRulePrefix), nil
	} else {
		return rule.protocolRepo.ExecuteWriter(writers.EraseErrorRulePrefix), nil
	}
}

func (rule EraseFileRule) Match(data string) bool {
	return rule.matcher.Match(data)
}